296 MORPHOLOGY AND EVOLUTION * branches radiate widely over the face, communicating with one another and with branches of the trigeminal nerve. There is, however, no fusion of main trunks as in the Chimpanzee. In the Orang there is a most complicated buccinator plexus. The auditory nerve is as in MaD. Glosso-pharyngeal Nerve.—In the Chimpanzee the ninth cranial nerve is similar to that in Man (Vrolik and Sonntag). In the Gorilla its branches of distribution and communication are richer than in the Chimpanzee. Vagus Nerve.—In all the Apes the origin, course and relations of the vagus are as in Man, but some of the branches differ; and there are, however, differences in its communications with the sympathetic system in the neck. In three Chimpanzees I found it communicating with the sympathetic on the left side, but it was extensively fused with the sympathetic on the right side. In the Orang, as in the Gorilla described by Eisler (442), it communicated with the sympathetic on both sides. There are also differences in the communication with the spinal accessory nerve. In the Chimpanzee the two nerves are strongly fused in the foramen laceruin posticum, but a strong communication runs between them in the Gorilla. The following table gives the cervical branches in the Chimpanzee (fig. 52), Gorilla, Orang and Man :— 1. Communicating to the ninth (c. IX), and twelfth (c. XII) cranial nerves, superior cervical ,, sympathetic ganglion iS.C.G.) and cervical plexus (C.C.P.).